/*
 * Copyright 2009 Armando Blancas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package samples.tasks.text;

import taskgraph.channels.CharChannel;
import taskgraph.tasks.Graph;
import taskgraph.tasks.Task.Wait;
import taskgraph.tasks.io.ReadTextFile;
import taskgraph.tasks.io.StandardOutput;
import taskgraph.tasks.text.UniqueLines;


/**
 * Counts the unique lines in the input file.
 *  
 * @author Armando Blancas
 */
public class Unique {
	
	/**
     * Creates a graph that counts the unique lines in a text file.
     * <p><pre>
     * [ReadText] --ch1--> [UniqueLines] --ch2--> [Stdout]
     * </pre>
	 */
	public static final void main(String[] args) {
		if (args.length == 0) {
			System.out.println("Usage: java samples.tasks.text.Unique <file>");
			System.exit(1);
		}
		
		System.out.printf("Input file: %s\n", args[0]);		
		
		try {
			Graph graph = new Graph();
			CharChannel ch1 = new CharChannel();
			CharChannel ch2 = new CharChannel();
			
			graph.add(new ReadTextFile(ch1.getOutputPort(), args[0]));
	        graph.add(new UniqueLines(ch1.getInputPort(), ch2.getOutputPort()));
	        graph.add(new StandardOutput(ch2.getInputPort())); 
			graph.execute(Wait.NO_WAIT);
		} catch (InterruptedException e) {
			System.err.printf("Interrupted:\n%s\n", e.getMessage());
		}
	}

}
